add "old-style cast" to the list of ignored warnings
add "old-style cast" to the list of ignored warnings

This variable comes from KWSys's forwarding executable code.

Visomics/Visomics,arborworkflows/Visomics,arborworkflows/Visomics,Visomics/Visomics,Visomics/Visomics,Visomics/Visomics,Visomics/Visomics,arborworkflows/Visomics,arborworkflows/Visomics,arborworkflows/Visomics,arborworkflows/Visomics,Visomics/Visomics